S Corp vs. C Corp: Key Differences and How to Choose the Best Structure

Deciding to incorporate your small business is a significant milestone, but it's not the only decision you'll face. You'll have to decide which business tax structure is optimal: an S corporation or a C corporation. Which is best for your operations as they scale?

Use this article to learn about their key differences, the tax implications, and how to make the right call for your business in 2026.

Understanding Corporate Structures

Before diving into similarities and differences, you should understand the basics of a corporate structure.

A corporation is a legal entity separate from its business owners, also known as shareholders. Corporations are, by default, considered C corporations. Filing IRS Form 2553 is the process of electing S corporation status.

Corporations offer limited liability protection, meaning shareholders are typically not personally liable for corporate debts or liabilities. Business owners gain personal asset protection from corporate claims, among other business tax benefits.

To form a corporation, the business owner must file Articles of Incorporation with the Secretary of State. Incorporation documents establish your registered agent, the adoption of bylaws, and the selection of the board of directors.

After incorporation, hold annual board meetings, file annual reports, and file quarterly and annual tax returns to maintain compliance.

What is an S corp?

The S corporation structure adheres to the Internal Revenue Code's Subchapter S rules. After incorporation, entrepreneurs can file Form 2553 to elect S corp status.

S corporations are pass-through entities for income tax purposes, meaning they do not pay corporate income tax on their earnings. S corps must distribute income and deductions to their shareholders annually. Each shareholder receives a prorated distribution based on their ownership percentage, as detailed on their individual Schedule K-1. Shareholders pay tax on their share of business income and can claim deductions to reduce their taxable income.

Business owners find the S corp business structure attractive because pass-through taxation avoids the double taxation that C corps are subject to. This can be a significant tax advantage, leading to real income tax savings and a reduced tax liability when they file their personal tax returns.

S Corp disadvantages (and requirements)

S corps must follow specific eligibility rules or risk having their S corporation status terminated. S corp eligibility requirements include:

• Cannot have more than 100 shareholders or more than one class of stock.

• Shareholders are U. S. citizens and cannot be corporations, partnerships, or nonresident aliens.

• Must generate less than 25% of its gross receipts from passive investment income.

• Must maintain records of each shareholder’s basis in the corporation.

These requirements can impact or limit how you conduct business. For example, if you intend to seek international investment or to hold more complex securities, you cannot operate as an S corporation. And don't forget the "reasonable salary" requirement. It is one of the most commonly misunderstood S corp rules and a frequent trigger for IRS audits.

Complex S corp rules and considerations can be complicated without experts on your side. We recommend consulting with accounting professionals who specialize in entity formation.

What is a C corp?

C corporations follow Subchapter C of the Internal Revenue Code, with all newly incorporated businesses defaulting to this structure.

C corporations can raise capital by adding an unlimited number of shareholders, who contribute cash in exchange for ownership in the business. Shareholders can include:

• Individuals

• Partnerships

• Corporations

• Other entities

Unlike S corps, C corps can issue multiple classes of stock. The Qualified Small Business Stock (QSBS) exemption is an advantage for C corps seeking outside investment. QSBS allows early founders, investors, and employees to legally exclude up to 100% of federal capital gains taxes on the sale of their stock.

C corps aren’t required to distribute earnings to shareholders, so C corp business owners aren’t guaranteed annual dividends. Instead, C corps may choose to reinvest earnings and fund business growth.

C Corp disadvantage(s)

The major downside to the C corp structure is double taxation. Double taxation means both the C corporation and its shareholders pay tax on the business’s income.

• First, the C corp pays tax on its net income.

• Second, the C corp’s shareholders pay tax on corporate dividends at the individual level.

Regardless, many small business owners find that the benefits of the C corp’s flexibility outweigh the additional tax burden of double taxation.

Need assistance determining whether the C corp business structure is right for your business? Our entity formation professionals can help.

S Corp vs. C Corp: The Similarities

While S corps and C corps differ, they also share similarities. The top similarities between S corps and C corps include:

• Limited liability protection

• Both are incorporated entities with a formal business structure

• Perpetual existence

• Owned by shareholders

• Both must hold annual meetings and comply with requirements that other entities, including limited liability companies (LLCs) and sole proprietorships, typically avoid.

S Corp vs. C Corp: The Key Differences

S corporations and C corporations share many characteristics. This table summarizes the key differences between S corp and C corp structures.

Tax Implications of Choosing S Corp vs. C Corp

Let’s consider this simplified example illustrating the tax impacts of an S corporation versus a C corporation.

Compare two corporations: QRS Company is an S corp, and ABC Company is a C corp. The companies share the following facts:

• Each corporation has two owners, and each owner holds a 50% ownership stake.

• During 2025, each corporation earned $1,000,000 and reported taxable income of $500,000.

• Each shareholder was subject to a combined federal and state income tax rate of 40% on corporate distributions. State tax rates vary and will affect the actual outcome.

S corp tax implications example

QRS Company met all S corp requirements and did not pay federal or state income tax.

QRS Company distributed all profits to its shareholders, so each owner received $250,000. Each S corp owner paid $100,000 in taxes on their distributions.

The shareholders each kept $150,000 after taxes.

C corp tax implications example

ABC Company paid $105,000 of federal income tax at a 21% flat corporate tax rate. Assuming a 7% state income tax rate, ABC Company paid $35,000 of state income tax.

The company distributed its after-tax income of $360,000 as dividends, resulting in each shareholder receiving $180,000. Each owner paid $72,000 in taxes on dividends.

The shareholders each kept $60,000 after taxes.

S corp vs. C corp: Summary of tax implications

These tables compare the example’s S corp vs. C corp tax implications.

The S corp shareholders enjoyed a lower total tax bill because S corps aren’t subject to double taxation. Further, the S corp shareholders kept more after-tax income than the C corp shareholders.

This example illustrates potential tax implications using a simplified fact pattern, but your decision between an S corporation and a C corporation should also consider non-tax factors.

If you’re interested in S corporation status for your company, we recommend consulting with tax professionals who can help you consider the economic and administrative implications.

How to Decide Between S Corp and C Corp

There are four key questions that you should ask yourself when determining which structure is best for your operations.

• Do you plan to raise outside capital or take the business public? If so, forming as a C corp is better.

• Do you want to minimize self-employment and corporate-level taxes now? If that's your goal, elect S corp status.

• How many shareholders do you expect, and what types? An S corp has strict limits, while C corps don't.

• Are you planning to reinvest profits rather than distribute them? In this scenario, a C corp is the superior choice.

C Corp vs. S Corp: Which Is Better?

When is a C corp better than an S corp?

It's more advantageous to operate as a C corp than an S corp when:

• Seeking outside investors

• Planning an IPO

• Retaining earnings for reinvestment

• Offering employee stock options

• Courting international shareholders

• Accessing specific tax deductions and benefits

Many owners start as S corps and convert to C corps before a fundraising round.

When is an S corp better than a C corp?

It's more advantageous to operate as an S corp than a C corp when:

• Avoiding double taxation

• Limiting shareholders and simplifying the class of stock

• Your strategy omits seeking significant outside capital or going public

• You prefer simpler governance and tax reporting responsibilities

How to Change from C Corp to S Corp (Or Vice Versa)

Filing an S Corp Election

C corp status is the default for new corporations. You can make an S corp election by filing IRS Form 2553 by March 15th if your business follows the calendar year.

Before filing, confirm that your business meets the S corporation requirements and prepare to provide information about each shareholder. Review the S corporation eligibility criteria and consult your tax professional if needed.

You may need to notify state and local taxing agencies of your S corp status, as some states require a separate state-level S corp election after federal approval.

We can help you determine which notifications and disclosures to file.

Terminating an S Corp Election

If you wish to end your S corp status and revert to a C corp, you can file a statement of revocation with the IRS by March 15th.

The statement should include:

• Your company’s information

• Shareholder details

• Shareholder signatures

Be sure to review the complete requirements and due dates before filing.

Making the Right Call on Your Business Structure

So, how do you determine whether an S corporation or a C corporation structure is best for your business? Ultimately, your decision requires weighing the benefits and drawbacks of each.

Consider your business plan for raising capital and your shareholders’ tolerance for double taxation at the corporate level. Determine the requirements of each corporate structure and whether you have the necessary resources to maintain compliance.

That decision is easier with expert support from 1-800Accountant. Our tax professionals can help you understand the complex implications for your business, support the entire entity formation process, and guide you throughout the year with professional tax planning and advisory.

Schedule a free 30-minute tax consultation to get started.

FAQs About S Corps and C Corps

Can an LLC elect S corp status?
Yes, an LLC can elect to be taxed as an S corp. To do this, the LLC files IRS Form 2553 with the IRS while ensuring it meets all standard S corp eligibility requirements, such as having no more than 100 shareholders. Keep in mind that this election only changes how the business is taxed federally; its underlying legal structure remains an LLC.

What is a reasonable salary for an S corp owner?
The IRS mandates that an S corp owner who performs significant services for the business receive a reasonable salary. While there is no exact formula, a reasonable salary is generally the amount a similar business would pay to hire a third party to perform those same services.
You can determine this figure by researching comparable wages in your specific industry and geographic location.

Can an S corp convert to a C corp?
Yes, an S corp can convert to a C corp tax classification. To make the switch, the corporation’s shareholders must agree and file a formal, written statement of revocation with the IRS service center where the S corp election was filed. You generally do not need to file a specialized IRS form; a signed statement revoking the Subchapter S status is sufficient action.

Do S corps offer liability protection?
Yes, S corps offer limited liability protection, meaning the owners, called shareholders, are typically shielded from the company's debts and legal liabilities. This protection is a feature of the underlying corporate entity, such as a traditional corporation or an LLC taxed as an S corp. It ensures that personal assets cannot easily be seized to satisfy business debts or lawsuits.

What tax forms do S corps and C corps file?
S corps are pass-through entities that file IRS Form 1120-S to report income and generate Schedule K-1s for their shareholders. In contrast, C corps are distinct taxable entities that file Form 1120 and report and pay corporate income tax on their own net profits. Additionally, both entities are required to file payroll tax returns (such as IRS Form 941, Employer's Quarterly Federal Tax Return) to report W-2 wages paid to owner-employees.

Can a C corp have international shareholders?
Yes, C corps have virtually no restrictions on who can own their stock, making them a popular choice for foreign individuals and international entities. This makes it easier for a C corp to raise venture capital or partner with international investors. However, foreign-owned C corps are required to file additional documentation, such as IRS Form 5472, Information Return of a 25% Foreign-Owned U. S. Corporation or a Foreign Corporation Engaged in a U. S. Trade or Business, to disclose transactions with their foreign owners.